负载于二氧化铈上的金和铱颗粒的透射电子显微镜观察。

TEM observations of Au and Ir particles supported on CeO2.

作者信息

Akita Tomoki, Okumura Mitsutaka, Tanaka Koji, Kohyama Masanori, Tsubota Susumu, Haruta Masatake

机构信息

Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, AIST Kansai, Midorigaoka 1-8-31, Ikeda, Osaka 563-8577, Japan.

出版信息

J Electron Microsc (Tokyo). 2005;54 Suppl 1:i81-5. doi: 10.1093/jmicro/54.suppl_1.i81.

DOI:10.1093/jmicro/54.suppl_1.i81

PMID:16157648

Abstract

Au/CeO2 and Ir/CeO2 catalysts were observed by a transmission electron microscope in order to investigate the nano-structures of Au and Ir particles and CeO2 grains and the interface structure between metallic particles and CeO2. An annular dark field scanning transmission electron microscope (ADF-STEM) and an energy dispersive X-ray spectroscopy (EDS) revealed that the metallic particles smaller than 2 nm in diameter are highly dispersed on CeO2 supports in both catalysts. For model samples of larger CeO2 particles with flat facets of low-index surfaces, high resolution transmission electron microscopy observations of Au/CeO2 and Ir/CeO2 interfaces were made and the epitaxial relationship between Au and CeO2, (111)[110]Au//(111)[110]CeO2 has been found for the first time.

摘要

为了研究金和铱颗粒以及二氧化铈晶粒的纳米结构和金属颗粒与二氧化铈之间的界面结构，用透射电子显微镜观察了金/二氧化铈和铱/二氧化铈催化剂。环形暗场扫描透射电子显微镜（ADF-STEM）和能量色散X射线光谱（EDS）显示，在两种催化剂中，直径小于2nm的金属颗粒高度分散在二氧化铈载体上。对于具有低指数表面平面小面的较大二氧化铈颗粒的模型样品，对金/二氧化铈和铱/二氧化铈界面进行了高分辨率透射电子显微镜观察，首次发现了金和二氧化铈之间的外延关系，即(111)[110]Au//(111)[110]CeO2 。